PORTSMOUTH, N.H.--(BUSINESS WIRE)--Jan 23, 2026-- Iron Mountain Incorporated (NYSE: IRM), a global leader in information management services, today announced the tax treatment for all 2025 distributions on its common stock. Form 1099 Box 1a Form 1099 Box 1b Form 1099 Box 2a Form 1099 Box 2b Form 1099 Box 2f Form 1099 Box 3 Form 1099 Box 5 Payment Date Total Distribution Ordinary Taxable Dividend Qualified Taxable Dividend (1) Total Capital Gain Distribution Unrecaptured Sec. 1250 Gain (2) Section 897 Capital Gain (2) Return of Capital Section 199A Dividend (1) ($ per share) ($ per share) ($ per share) ($ per share) ($ per share) ($ per share) ($ per share) ($ per share) Jan 7, 2025 $0.715000 $0.436917 $0.000003 $0.000000 $0.000000 $0.000000 $0.278083 $0.436914 Apr 4, 2025 $0.785000 $0.479692 $0.000003 $0.000000 $0.000000 $0.000000 $0.305308 $0.479689 Jul 3, 2025 $0.785000 $0.479692 $0.000003 $0.000000 $0.000000 $0.000000 $0.305308 $0.479689 Oct 3, 2025 $0.785000 $0.479692 $0.000003 $0.000000 $0.000000 $0.000000 $0.305308 $0.479689 Totals $3.070000 $1.875993 $0.000012 $0.000000 $0.000000 $0.000000 $1.194007 $1.875981 (1) Qualified Taxable Dividend and Section 199A Dividend are subsets of, and included in, Ordinary Taxable Dividend.